[mw_shl_code=c,true]void TIM3_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); TIM_TimeBaseStructure.TIM_Period=5000; TIM_TimeBaseStructure.TIM_Prescaler=8399; TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure); TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); TIM_Cmd(TIM3,ENABLE); NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //?ü?????? NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //??????????0 NVIC_InitStructure.NVIC_IRQChannelSubPriority =1; //?ì????????1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //???í???? NVIC_Init(&NVIC_InitStructure); }[/mw_shl_code] [mw_shl_code=c,true]void TIM3_IRQHandler(void) { if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET) //???????? { //USART_handler(); } TIM_ClearITPendingBit(TIM3,TIM_IT_Update); //????????±ê???? }[/mw_shl_code]
[mw_shl_code=c,true]int main(void) { NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // gpio_init(); TIM3_Init(); while(1) { ; } }[/mw_shl_code] 定时器的配置、中断服务函数和主函数如上，程序能进入定时器中断服务函数，但是过一会儿必定进入hardfalut_handler里面，想请教一下大概会是什么原因？（用过外部中断、串口接收中断都没出错）谢谢！